Improved soap



UNITED STATES PATENT OFFICE.

D. B. CHAPMAN, OF HOPEDALE, MASSACHUSETTS.

IMPROVED SOAP.

Specification forming part of Letters Patent No. 43,758, dated August 9, 1864.

To all whom it may concern:

Be it known that I, DUDLEY B. CHAPMAN, of Hopedale, in the county of Worcester and State of Massachusetts, have made a new and useful invention having reference to the manufacture of soap; and 1 do hereby declare the same to be fully described, as follows.

The nature of my invention consists in a soap made by incorporating a soft soap (made with potash or wood-ash lye) in which the lye is retained with a hard soap from which the lye has been precipitated, and which may be made either with or without an alkaline silicate.

In carrying out my invention a soft soap is to be first manufactured in the usual manner by boiling rough grease, fat, or oil with a lye made from potash or wood ashes, the proportions of the ingredients being such as commonly employed in the making of what soapboilers and others tenn soft soap. Next a hard soap is to be made in the usual manner by boiling a fatty or oily matter with a sodalye or a lye made of soda and potash, or one made of soda and wood ashes, in such proportions as may be desirable. Next, and while the soap is a fluid state, the spent lye is to be precipitated from it by the addition to it of a suffieient quantity of chloride of sodium. After the spent lye may have been thoroughly or sufficiently precipitated it should be removed from the kettle either by a siphon or by any otherpropermeans. Next the softsoap, made as hereinbefore described, is to beincorporated with the hard soap either by boiling or stirring the two together until they may be thoroughly intermixed. After the compound may have become co l or sufficiently indurated, it may be out up into bars or formed into cakes or blocks of the size and form proper for the market or for ordinary use.

Wherever it may be desirable to use an alkaline silicatein themanufacture of the compound soap, it(the silicate) should be mixed with the soft soap before the latter may beincorporated with the hard soap.

The proportions of the hard and soft soaps in the mixture of them are not arbitrary; but generally two parts, by weight, of the hard soap from which the spent lye may have been precipitated added to one part, by weight, of the soft soap will suffice in producing an excellent compound soap.

Owing to the deliquescent property of potash, the compound soap will notlose weight so rapidly whiledrying as a hard soap made in the ordinary manner.

In my improved soap the lye of the soft soap is retained. With reference, therefore, to ordinary hard soap, the emulsive and detergent qualities ot'the compound soap are much greater than those of such ordinary hard soap. Furthermore, a mass of the compound soap can be more economically made than the same weight of the ordinary soap, and will be found equally useful, if not more so, in most respects. It is also a harder soap.

The economy of the manufacture of the compound soap may be thus demonstrated or described: The ordinary hard soap, when in the kettle and ready to be framed, costs at the present time about eleven cents per pound. Soft soap costs to make it from two to four cents per pound, according to the quality of the stock used. It will thus be seen that a pound of the compound soap costs to make it about eight and one-third cents, or it can be made for two and two-thirds cents cheaper than a pound of the ordinary hard soap, and when made will be preferable in many respects.

I claim as my invention-- The compound soap made substantially as hereinbefore described.

D. 13. CHAPMAN.

Witnesses:

R. H. EDDY, F. P. HALE, Jr. 

